“The slightly convex sapphire crystal of the Concentric chronograph reveals the elegance and meticulous decoration of the mechanism. In addition to its new shape, the oscillating weight is decorated with C?¥tes de Gen?®ve, rhodium-plated and engraved with the Pierre DeRoche logo. The circular bridge forming a distinctive crown-shaped motif is decorated with C?¥tes de Gen?®ve and protected by a fine layer of ruthenium chosen for its resistance to oxidation and its high resistance. Moreover, Pierre DeRoche has highlighted the two bridges of the chronograph mechanism by a similar ruthenium-treated decoration. Finally, each movement carries its own number, engraved on the oscillating weight.”